If a bus travels 160km in 4hours and a train travels 320km in 5 hours at uniform speeds. than the ratio of the distance travelled by them in 1 hours is (a) 1:2 (b) 4:5 (c) 5:8 (d) 8:5​

What is the value of r of the geometric series?

Which expression converts 45 degree to radians

At the beginning of year 1, carlos invests $600 at an annual compound interest rate of 4%. he makes no deposits to or withdrawals from the account. which explicit formula can be used to find the account's balance at the beginning of year 5? what is, the balance?